Compare Asda petrol and diesel prices across forecourts in and around Carmarthen, Swansea. Cheapest unleaded from 174.9p, diesel from 199.9p. Updated today, 23 October 2026.
| Forecourt | Unleaded | Diesel | Distance |
|---|---|---|---|
| ASDA WHITE MILL EXPRESS PETROL A40, CARMARTHEN |
174.9p | 199.9p | 3.3 mi |